The issues are strangely numbered. Issue #1 is designated "1.2", #2 is "2.4", #3 is "3.6" and #4 is "4.8".

THE STORY: The appearance of twin colossal constructs (the Harbingers of the Everlasting Winter) signal the beginning of the end for humanity -- unless the Avengers and the Fantastic Four leap into the past and recover the key to the world's salvation.